private HttpResponse makeOAuthProblemReport(String code, String text, int rc) throws IOException {
   if (vagueErrors) {
     return new HttpResponseBuilder()
         .setHttpStatusCode(rc)
         .setResponseString("some vague error")
         .create();
   }
   OAuthMessage msg = new OAuthMessage(null, null, null);
   msg.addParameter("oauth_problem", code);
   msg.addParameter("oauth_problem_advice", text);
   return new HttpResponseBuilder()
       .setHttpStatusCode(rc)
       .addHeader("WWW-Authenticate", msg.getAuthorizationHeader("realm"))
       .create();
 }
 /**
  * Construct an HTTP request from this OAuth message.
  *
  * @param style where to put the OAuth parameters, within the HTTP request
  */
 public static HttpMessage newRequest(OAuthMessage from, ParameterStyle style) throws IOException {
   final boolean isPost = OAuthMessage.POST.equalsIgnoreCase(from.method);
   InputStream body = from.getBodyAsStream();
   if (style == ParameterStyle.BODY && !(isPost && body == null)) {
     style = ParameterStyle.QUERY_STRING;
   }
   String url = from.URL;
   final List<Map.Entry<String, String>> headers =
       new ArrayList<Map.Entry<String, String>>(from.getHeaders());
   switch (style) {
     case QUERY_STRING:
       url = OAuth.addParameters(url, from.getParameters());
       break;
     case BODY:
       {
         byte[] form = OAuth.formEncode(from.getParameters()).getBytes(from.getBodyEncoding());
         headers.add(new OAuth.Parameter(CONTENT_TYPE, OAuth.FORM_ENCODED));
         headers.add(new OAuth.Parameter(CONTENT_LENGTH, form.length + ""));
         body = new ByteArrayInputStream(form);
         break;
       }
     case AUTHORIZATION_HEADER:
       headers.add(new OAuth.Parameter("Authorization", from.getAuthorizationHeader(null)));
       // Find the non-OAuth parameters:
       List<Map.Entry<String, String>> others = from.getParameters();
       if (others != null && !others.isEmpty()) {
         others = new ArrayList<Map.Entry<String, String>>(others);
         for (Iterator<Map.Entry<String, String>> p = others.iterator(); p.hasNext(); ) {
           if (p.next().getKey().startsWith("oauth_")) {
             p.remove();
           }
         }
         // Place the non-OAuth parameters elsewhere in the request:
         if (isPost && body == null) {
           byte[] form = OAuth.formEncode(others).getBytes(from.getBodyEncoding());
           headers.add(new OAuth.Parameter(CONTENT_TYPE, OAuth.FORM_ENCODED));
           headers.add(new OAuth.Parameter(CONTENT_LENGTH, form.length + ""));
           body = new ByteArrayInputStream(form);
         } else {
           url = OAuth.addParameters(url, others);
         }
       }
       break;
   }
   HttpMessage httpRequest = new HttpMessage(from.method, new URL(url), body);
   httpRequest.headers.addAll(headers);
   return httpRequest;
 }